George h



y uiten -tsfs @anni @Hirn Aencuen n.` PALMEn or Naw BEDFORD, MASSACHUSETTS. Letters Parma No. 57,795, daad August 13, 1867,.

'IMPROVEMENT IN Monrrsr KNoB-LATGHES.

ro ALL WHoM 1r MAY ooNoERN;

Be it known that I, GEORGE H. PALMER, of New Bedford, in the county of Bristol, and State of Massa chusetts, have invented a new and improved Mortise-Latch.; and I dohereby declare that the following s a full, clear, and exact description thereof, which will enable othersV skilled inthe art to make and use the` same, reference being had to the accompanying drawings, forming part of this' specication.

This invention relates to a new and improved mortise-latchfor doors,4 Ste.; and it consists in a new and improved manner of attaching or connecting `the latch to the hub of 'the door-arbor, as hereinafter fully shown and described, whereby the latch, in case of the door being closed while the hand of the operator is upon the knob, may be forced back and made to catch into or engage with the nosing or strike equally as well as if the knob were perfectly free. i

` Figure 1 is a longitudinal sectionlof'my invention taken in the line a a', fig. 2. i

Figure 2, a. longitudinal section 'of the's'ame taken in the line yy, lig. 1. i

Figure 3, a transverse section of the Same taken in the line z 3, Hg. 2.

Similar letters of reference indicate like parts.

A represents the .case of the latch, which is of cylindrical form so that itmaybe inserted in'a door by simply boring an auger hole therein. This caso is composed of equal Vlongitudinal parts a a, connected at their ends by bands b b. B is the latch, bevelled at one side, as shown at c, and having twoplates, (Zd, attached-one at its upper and the other at its lower side, said plates working in grooves ee inlthe inner surface of the case, and serving as guidesl for the latch, 'as will. be fully-understood by referring to fig." 3. The latch is connected bytwo links C D to the hub E, through which the knob-arbor F passes. This hub is arranged in the usual way, and the'link D is connected to it by a pivot,f, the other link C being connected to the latch B by a pivot, g. The two links C D fare also connected by a pivot, g", the latter passing through au oblong slot, h, in the link D. The link C is formed of `two pla-tes z', so that it may be moved towards the hub E without affecting thc link D, the plates iz' working' each side of D, as will be fully understood by referring to fig. 2. The plates zz'of Athe link C are each connected by a spiral spring,'j, with the outer end of the case A, and these springs have a tendency to keep the latch B forced outward from the case, as will be fully understood by referring to fig. 2. Inbpening the door the knob Gr on the arbor F is trrrned'as usual in order to draw in the latch B free from tho nosing or strike in the door-frame, and in closing the door the latch B will be forced or pressed inward in consequence of its bevelled'side c coming in contact with the nosing or strike, and it will be seen that the latch may be thus pressed or forced inward without turning the hub E of the knob-arbor, as the link C is allowed to slide over or upon the link D, the pin or pivot g of C working in the sloth in. D. VHence, if the knob G be held by the operator in closing the door it will not affect in the least the free inward movement ofthe latch in the case.

'Having thus described myiinvention, I claim as new, and desire to secure by Letters Patent- 1. The cylindrical lock-case A, constructed as described, consisting of the longitudinal sections a secured together by` means of the'rings b, as herein set forth for the purpose specified.A v

` 2. vThe latchB,vhaving upon its upper and lower lsides the guiding-plates l d, sliding in grooves e e, of the case A, arranged in relation with the dove-tailed pivoted link C, slotted pivoted link Drsprings jj upon opposite sides of the link C, and the slotted hub E, as herein set forth for the purpose specified.

3. The latch B, when provided with the guiding-plates d, sliding in the grooves e e of the lock-case A, as

and for the'purpose specified.

The above specification of my Ainvention signed by me this 6th day of February, 1867.

GEO. H. PALMER.

Witnesses: I

ALEX. FL'RoBERrs, O. MAcDANIEL. 

